I am going to get a tune put on our 06 pickup this week. Eventually we will be putting on a different muffler in place of the original muffler. Since, the tune I am getting, he checks out the afr, is it necessary to get the tune updated once I put in a different muffler like a flowmaster or magnaflow?

The guy that I am getting it done with, said no. I just wanted to hear all of your opinions.

 

Nope, won't be a problem if tuned properly.

 

+1 current tune will work fine

 

What do you mean by that? Or what does the tuner need to do to compensate for a more free flowing exhaust that will be added in the future?

 

Assuming that you're still using the MAF, it will pick up the increased airflow due to the volumetric efficiency increase of the engine. Increased airflow = increased cylinder airmass. If your tune is set up with a flat timing value for all load points considered "WOT", then as you increase airflow into the engine, your timing requirements will no longer match what has been programmed into the tune.

If the spark tables are set up resembling the stock tables shape (eg. timing decreases as airmass increases), then there will be no need to update.

Of course, this is all a wash with just a swap from single to dual exhaust, as the increase in efficiency just won't be big enough to significantly increase airflow.

 

Ok, I understand. I am not putting a cold air intake on the truck, probably just going to the route of replacing the stock muffler with something like a flowmaster and put a tip on the end to kind of dress it up. So, he will probably won't have to even worry about compensating for that, will he?